"Recipe Note: Make sure and let these sit overnight!..."
INGREDIENTS
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For the cookies: 6 cups flour, divided 1 teaspoon baking soda 1 teaspoon baking powder 1 cup butter, at room temperature 2 cups granulated sugar 3 eggs 1 teaspoon vanilla extract 1 1/2 cups light sour cream For the frosting: 1 cup butter, at room tem